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Finding the Fourth Proportional to 1,080.20, 1,620.53 and 386.90

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Solution

The fourth proportional to 1,080.20, 1,620.53 and 386.90 is: 580.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.20 : 1,620.53 = 386.90 : x
  2. Step 2: Convert to fraction form
    1,080.20/1,620.53 = 386.90/x
  3. Step 3: Cross multiply
    1,080.20x = 1,620.53 × 386.90
  4. Step 4: Simplify right side
    1,080.20x = 626,973.02
  5. Step 5: Solve for x
    x = 626,973.02/1,080.20
  6. Step 6: Final answer
    x = 580.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.